Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Sedimentary Rocks Say Thanks to the Authors Click http://www.ck12.org/saythanks (No sign in required) To access a customizable version of this book, as well as other interactive content, visit www.ck12.org CK-12 Foundation is a non-profit organization with a mission to reduce the cost of textbook materials for the K-12 market both in the U.S. and worldwide. Using an open-source, collaborative, and web-based compilation model, CK-12 pioneers and promotes the creation and distribution of high-quality, adaptive online textbooks that can be mixed, modified and printed (i.e., the FlexBook® textbooks). Copyright © 2015 CK-12 Foundation, www.ck12.org The names “CK-12” and “CK12” and associated logos and the terms “FlexBook®” and “FlexBook Platform®” (collectively “CK-12 Marks”) are trademarks and service marks of CK-12 Foundation and are protected by federal, state, and international laws. Any form of reproduction of this book in any format or medium, in whole or in sections must include the referral attribution link http://www.ck12.org/saythanks (placed in a visible location) in addition to the following terms. Except as otherwise noted, all CK-12 Content (including CK-12 Curriculum Material) is made available to Users in accordance with the Creative Commons Attribution-Non-Commercial 3.0 Unported (CC BY-NC 3.0) License (http://creativecommons.org/ licenses/by-nc/3.0/), as amended and updated by Creative Commons from time to time (the “CC License”), which is incorporated herein by this reference. Complete terms can be found at http://www.ck12.org/about/ terms-of-use. Printed: September 15, 2015 www.ck12.org C HAPTER Chapter 1. Sedimentary Rocks 1 Sedimentary Rocks Name___________________ Class______________ Date________ Read this passage based on the text and answer the questions that follow. How Sedimentary Rocks Form Sedimentary rocks form in two ways. Particles of sediment may be compacted and cemented together, or chemicals may precipitate out of water. Sedimentary rocks that form when sediments are compacted and cemented together are called clastic sedimentary rocks. First, the sediments are compacted as they are squeezed together by the weight of all the sediments that have been deposited on top of them. Then, the sediments are cemented together, as minerals fill in the spaces between sediment particles. The cementing minerals come from water that moves through the sediments. Clastic sedimentary rocks are grouped by the size of the sediments they contain. Conglomerate and breccia are made of individual stones that have been cemented together. In conglomerate, the stones are rounded. In breccia, the stones are angular. Sandstone is made of sand. Siltstone is made of silt particles, which are smaller than sand but larger than clay. Shale consists of the smallest sediments. It is made mostly of clay and hardened mud. Sedimentary rocks that form when chemicals precipitate out of water are called chemical sedimentary rocks. Halite, also called rock salt, forms in this way. You can make halite by simply leaving a shallow dish of salt water out in the sun. As the water evaporates, salt crystals form in the bottom of the dish. Gypsum is another example of a chemical sedimentary rock. Questions 1. 2. 3. 4. Name two ways that sedimentary rocks can form. Describe how clastic sedimentary rocks form. Compare and contrast conglomerate and shale. Explain how chemical sedimentary rocks form, and give two examples. 1